It's interesting (I should not be understood as agreeing that Texas will beat KSU, etc.). In that scenario I think it is SEC winner against Oregon. If the Ducks lose two, well, I really couldn't tell you. There would be lots of screaming about another SEC vs. SEC matchup, but it's what would make sense. But I don't see any way Oregon loses twice, though I think once is within the realm of possibility. In fact, I think they are more likely to drop one than KSU.
So then try to figure out the scenario with KSU undefeated, and Oregon, Alabama and Notre Dame with one loss each.